Watch NBC Action News HD at 5 & 10pm as we track the potential for heavy rain across the region!
Good warm and humid afternoon to everyone! After about a one day break from the humid air it surged back into the region on schedule overnight. Dew points today have been in the low 70s and air temperatures in the mid to upper 80s. The abundant cloud cover across the area is the only thing holding us back from making a run at 90 today.
Outside of the stratocumulus over the region. Look at the line of clouds that extends from eastern Nebraska into central Kansas. This is a developing line of strong thunderstorms and the SPC has just issued a tornado watch for this area. The watch does not include our viewing area, but is very close.

The line of clouds on the satellite below is near a stationary front(at the moment). This same front will drop southeast as a cold front on Sunday and give us a chance of thunderstorms for Sunday into Monday.

Before we discuss the rain chances I want to show everyone the surface map. A few things to notice. One the pockets of 90s in southeast Nebraska and into Iowa. Secondly the very humid air on top of Kansas City. And finally the front associated with the wind shift to the west.

With the thunderstorms developing to our west and the front sagging south tonight, it is possible that some of the thunderstorms push into northeast Kansas and northern Missouri. This complex could develop into an MCS and push east. I don't expect any rain in the metro tonight or early Sunday, but it may be close and we will need to watch how far south the storms and a possible outflow boundary advances. This may impact our thunderstorm development time on Sunday if the outflow settles near Kansas City.
For Sunday, Flash Flood Watches go into effect for the entire viewing area. Right now it looks like most of the thunderstorms(after any early morning stuff) should hold off until mid to late afternoon. Thunderstorms will first be possible around or north of St. Joe and then begin to work south during the afternoon/evening. There is a slight risk of severe weather on Sunday, but I think this would mainly be with the initial thunderstorm development or cells out ahead of the main line. Greatest threat would be strong winds and hail. The thunderstorms should merge into a linear structure or a line and move slowly. This is the part where the greatest concern develops...heavy rain. Right now it looks like a heavy band of 1-3" or more will develop somewhere within the viewing area just as we were thinking yesterday. The 18Z NAM has that band occurring from the far southside of the metro into the southern part of the viewing area. While the 18Z GFS has the heavy rain from around St. Joe right thru the metro. The GFS is a little more bullish with the rain totals.
Let's look at things from the standpoint of the 12Z NAM & GFS for several locations in the area. Here are the model forecast rain totals.
Location NAM GFS
KCI Airport 2.39" 2.96"
Olathe 2.65" 2.51"
St. Joseph 1.60" 3.18"
Knob Noster 1.68" 0.84"
Chillicothe 2.06" 2.59"
Emporia 2.74" 3.32"
No matter what any model says right now, it looks like flooding will be a concern for the viewing area and some locations will see 1-3"+.
Jeremy